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n in (-oo:+oo)
(2/3)*(n-9) = 8/9 // - 8/9
(2/3)*(n-9)-(8/9) = 0
(2/3)*(n-9)-8/9 = 0
2/3*(n-9)-8/9 = 0
(2/3*9*(n-9))/9-8/9 = 0
2/3*9*(n-9)-8 = 0
6*n-62 = 0
(6*n-62)/9 = 0
(6*n-62)/9 = 0 // * 9
6*n-62 = 0
6*n-62 = 0 // + 62
6*n = 62 // : 6
n = 62/6
n = 31/3
n = 31/3
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